What does it mean if i am coughing up blueish green mucus.

Sputum: The cause of the coloration of the mucous suggests that you may be having growth of a pigment producing bacteria like Pseudomonas in your upper respiratory tract. Hopefully you do not have other symptoms, since although rare, this organism can produce outpatient acquired lung infection. If you smoke, stop. If this continues make a list of all symptoms and see a doctor.